Remove unused class

app/static/css/nopaque.css

@@ -101,9 +101,6 @@ indicator will show up how the column is sorted right now.; */
 .service[data-service]:before {
   content: "help";
 }
-.service[data-service="corpus"]:before {
-  content: "book";
-}
 .service[data-service="setup_files"]:before {
   content: "burst_mode";
 }